Sankovic K, Krilov D, Herak J N
Department of Pharmacy and Biochemistry, University of Zagreb, Croatia, Yugoslavia.
Radiat Res. 1991 Nov;128(2):119-24.
Thiocytosine molecules incorporated in the cytosine monohydrate crystal lattice act as traps for both electrons and holes. The radiation-induced cytosine ion radicals, C(+) and C(-), release their charge upon heating. The excess electrons and holes migrate long distances in the crystal lattice. The migration of holes has been demonstrated by the postirradiation, thermally activated accumulation of thiocytosine cation radicals, T(+), and the migration of electrons by formation of the S-centered radicals of an anionic nature. It is estimated that the migration length of the holes is at least 30 interbase distances, and the migration length of the electrons is more than 100 interbase distances. The selective formation of the cationic and anionic trap radicals, depending on the trap concentration, is discussed in terms of differences between the migration of electrons and holes.
掺入一水合胞嘧啶晶格中的硫代胞嘧啶分子充当电子和空穴的陷阱。辐射诱导的胞嘧啶离子自由基C(+)和C(-)在加热时释放电荷。过量的电子和空穴在晶格中长距离迁移。空穴的迁移已通过硫代胞嘧啶阳离子自由基T(+)的辐照后热激活积累得到证明，电子的迁移则通过形成阴离子性质的S中心自由基得到证明。据估计，空穴的迁移长度至少为30个碱基间距，电子的迁移长度超过100个碱基间距。根据电子和空穴迁移的差异，讨论了取决于陷阱浓度的阳离子和阴离子陷阱自由基的选择性形成。
